A study has been carried out of the vulcanization of ethylene–propylene copolymers having different propylene contents, by use of an organic peroxide. The polymersolvent interaction parameter μ, calculated by the Flory‐Rehner equation from values of νe and vr, was found to be a linear function of vr with benzene as the swelling agent. Values of μ and their dependence upon vr were independent of copolymer composition, at least within the limits of experimental error, for samples having a propylene content of 30–60 mole‐%. The crosslinking efficiency of the peroxide used was found to depend considerably on copolymer composition, in agreement with the results found for dicumyl peroxide. Finally, sulfur as a crosslinking coagent was found to exert a large effect on the value of νe, calculated from the equilibrium retractive force of benzene‐swollen specimens.
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Flisi et al. (1968) studied this question.
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